Red wines are made from grapes with very dark, purple/blueish skin. However the juice from these black grapes run clear, same as the grapes used in white wine. In fact, most white Champagne and sparkling wines use the juice of a black grape called Pinot Noir! So how do red wines become so inky red? From the skins! Unlike white wines, the skins of the pressed grapes are mixed in and left with the juice. This results in the color from the grape skins leeching out and mixing in with the juice. Depending on the length of time the skins are allowed to mix with the juice, a winemaker can create anything from a dark, deep purple to a bright ruby red for a medium soak, or even a pink rose for a short dip.
In addition to receiving color from the skins, red wine also absorbs something called "tannin". Tannins occur naturally in grape skins, stems, and seeds and they are responsible for the mouth-drying qualities of a red wine. It is the same sensation you get when drinking a very strong tea. Tannins are the most important difference between a red and white wine. Tannin is what gives a red it's structure, and also serves as a preservative, granting red wines extra longevity.
Style
Reds basically come in three different styles:
Light & Fruity
Think french Beaujolais Nouveau, cheaper Australian reds, and wines containing grape varietals such as Gamay, Cabernet Franc, or Grenache. These wines are simple, every day drinking wines, with very fruity, berry-like flavors, and low tannins.
Medium & Subtle
Mid to low in the fruit department, with average tannins and medium body. This style of wine is characterized by table wines from Italy, French Bordeaux and Pinot Noir. Some spicy wines from the Rhone and Malbecs from Argentina will fall into this category.
Powerful
These are very fruity, rich, deep wines. Full bodied and generally expensive, this style of red tends to hail from warmer climates such as California and Australia. Italian Barolo and Barbarescos are also built full on and good years in Bordeaux will yield powerful wines.



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